@nepeta
Thanks for your response.
This article puts it to words better than I was able to lysistrata327.substack.com/p/reflections-on-the-gender-debate-8d2?s=r
Some specific points
"My beef is with the fact that all names for the female biological sex are being erased"
I don't think this is really such a departure from where we are today, the group of people you consider "biological women" already includes people with no breasts, infertile people, people with every mix of chromosomes.
"And I am extremely worried about the erasure of terms we can use to explain why girls over twelve still cannot go to school in Afghanistan."
It's still possible to say "girls in Afghanistan suffer hugely from an authoratian patriarchal regime."
"If the two biological sexes indeed were truly equally treated, then it wouldn't matter what identity people pick for themselves."
Looking forward to the day!
"and, in theory, man, though in practice very few are re-defining men"
The conversation (especially on this forum) focuses on trans women because they are easier to demonise, in the same "protect weak women and children" way as minorities have been treated through history. I suspect that trans women are better for triggering people's disgust reaction, "I can understand a trans man wanting to gain in privilege, but why would a trans woman want to give up her male privilege".
"current impossibility of even discussing them online."
Agree here, the quality of discourse (especially here) is dire. If you want to DM me, I'm also happy to discuss things less publicly.
"One of the major questions I have is how a replacement categorisation based on femininity..."
Like it or not, we do live in a society with gender, and trans people do do better when they interact with society as their correct gender. There is also the case of identity, I think cis people just don't notice it, but trans people do feel a disconnect between their gender identity and body/interactions with society.
It's a deep and interesting question. I would suggest that this forum is probably one of the worst places to examine it though.
"The exception was female reproductive rights,"
How did infertile cis women fit into your framework?
"basic idea of feminism as centrally focused on combating sex-based discrimination"
There is no reason why trans-inclusive feminism can't keep fighting for all of these causes. Furthermore, I don't think any discrimination or misogyny has been because of my biology more than it has been because I am and express myself as a woman. People who discriminate don't know my chromosomes, or genitals, or what's written on my birth certificate. Having said that, there definitely does exist systemic oppression which harms lots of women because of their biology. For just one example, take menstruation, it's a burden which doesn't affect most men. But some women don't menstruate, nonetheless, they are still women, even though they don't suffer directly from this form of oppression. I would still consider, for example, increasing accessibility for period products as falling under the "feminism" umbrella.